What is the cheapest airline that flies from Lambert-St Louis to Sofia?

British Airways and United Airlines are the most popular carriers operating from Lambert-St Louis to Sofia

When did momondo last update prices for flights from Lambert-St Louis Airport to Sofia Airport?

Prices for flights from Lambert-St Louis Airport to Sofia Airport are updated daily.

How many operators does momondo search for flights from Lambert-St Louis Airport to Sofia Airport?

The number of operators available for flights from Lambert-St Louis Airport to Sofia Airport is 2 as of September 2025.

How old do you have to be to fly from Lambert-St Louis Airport to Sofia Airport?

The minimum age for a child to fly alone is five, but airlines that offer an unaccompanied minor (UNMR) service may have their own age limitations. Flight duration, scheduling, and layovers are among the considerations that may influence age limits. We recommend that you double-check with the airline you are booking with for travel from Lambert-St Louis Airport to Sofia Airport.

What documentation or ID do you need to fly to Sofia Airport?

The travel and health documents you'll need for your trip to Sofia Airport may differ based on your itinerary and personal situation. Typically, you should have several documents on hand, such as a national ID card or driver's license and a passport that is valid for six months after your intended arrival at Sofia Airport. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.

$416 Cheap Flights from St. Louis to Sofia in 2025

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Find the cheapest flights from St. Louis to Sofia

Round-trip

One-way

Last minute

Cheap round-trip flights

12:25 pm - 12:00 pmSTL-SOF

15h 35m2 stops

6:10 am - 1:55 pmSOF-STL

15h 45m1 stop

$565Lufthansa

Find Deal

Wed, Oct 15 - Fri, Nov 14

12:25 pm - 12:00 pmSTL-SOF

15h 35m2 stops

6:10 am - 1:55 pmSOF-STL

15h 45m1 stop

$569Lufthansa

Find Deal

Wed, Oct 15 - Fri, Nov 14

1:30 pm - 1:15 pmSTL-SOF

15h 45m2 stops

2:35 pm - 3:29 pmSOF-STL

32h 54m2 stops

$581

Find Deal

Wed, Oct 15 - Fri, Nov 14

4:05 pm - 12:00 pmSTL-SOF

35h 55m2 stops

6:00 am - 3:29 pmSOF-STL

41h 29m2 stops

$586Air Canada

Find Deal

Sun, Oct 19 - Tue, Nov 4

3:30 pm - 5:50 pmSTL-SOF

18h 20m1 stop

2:00 pm - 11:44 pmSOF-STL

17h 44m2 stops

$587Lufthansa

Find Deal

Wed, Oct 15 - Thu, Nov 13

6:43 pm - 6:20 pmSTL-SOF

16h 37m2 stops

6:10 am - 1:55 pmSOF-STL

15h 45m1 stop

$593Lufthansa

Find Deal

Mon, Oct 27 - Wed, Nov 19

5:30 pm - 10:45 pmSTL-SOF

21h 15m2 stops

6:10 am - 1:55 pmSOF-STL

15h 45m1 stop

$605United Airlines

Find Deal

Tue, Nov 25 - Wed, Dec 3

1:30 pm - 1:15 pmSTL-SOF

15h 45m2 stops

2:35 pm - 3:29 pmSOF-STL

32h 54m2 stops

$611

Find Deal

Wed, Oct 15 - Fri, Nov 14

1:35 pm - 6:20 pmSTL-SOF

20h 45m2 stops

2:35 pm - 3:29 pmSOF-STL

32h 54m2 stops

$612United Airlines

Find Deal

Tue, Nov 25 - Thu, Dec 4

4:05 pm - 6:00 pmSTL-SOF

17h 55m2 stops

2:35 pm - 3:29 pmSOF-STL

32h 54m2 stops

$668Air Canada

Find Deal

Thu, Nov 27 - Fri, Dec 5

Lufthansa flights from St. Louis to Sofia

Our best Lufthansa deals on St. Louis to Sofia flight tickets

Lufthansa

Oct 15

STL12:25 pmLambert-St Louis

15h 35m

2 stops

SOF12:00 pmSofia

Nov 14

SOF6:10 amSofia

15h 45m

1 stop

STL1:55 pmLambert-St Louis

$565

Find similar

Lufthansa

Oct 15

STL12:25 pmLambert-St Louis

15h 35m

2 stops

SOF12:00 pmSofia

Nov 14

SOF6:10 amSofia

15h 45m

1 stop

STL1:55 pmLambert-St Louis

$569

Find similar

Lufthansa

Oct 15

STL3:30 pmLambert-St Louis

18h 20m

1 stop

SOF5:50 pmSofia

Nov 13

SOF2:00 pmSofia

17h 44m

2 stops

STL11:44 pmLambert-St Louis

$587

Find similar

Air Canada flights from St. Louis to Sofia

Our best Air Canada deals on St. Louis to Sofia flight tickets

Air Canada

Oct 19

STL4:05 pmLambert-St Louis

35h 55m

2 stops

SOF12:00 pmSofia

Nov 4

SOF6:00 amSofia

41h 29m

2 stops

STL3:29 pmLambert-St Louis

$586

Find similar

Air Canada

Nov 27

STL4:05 pmLambert-St Louis

17h 55m

2 stops

SOF6:00 pmSofia

Dec 5

SOF2:35 pmSofia

32h 54m

2 stops

STL3:29 pmLambert-St Louis

$668

Find similar

Air Canada

Nov 27

STL4:05 pmLambert-St Louis

17h 55m

2 stops

SOF6:00 pmSofia

Dec 8

SOF2:20 pmSofia

57h 09m

2 stops

STL3:29 pmLambert-St Louis

$687

Find similar

Fly from

Fly to

Route

Depart

Return

Price

St. LouisSofia

STL - SOF

STLSOF

Lambert-St Louis

Wed 10/15

12:25 pm-12:00 pm

2 stops15h 35m

Sofia

Fri 11/14

6:10 am-1:55 pm

1 stop15h 45m

$565

St. LouisSofia

STL - SOF

STLSOF

Lambert-St Louis

Wed 10/15

12:25 pm-12:00 pm

2 stops15h 35m

Sofia

Fri 11/14

6:10 am-1:55 pm

1 stop15h 45m

$569

St. LouisSofia

STL - SOF

STLSOF

Lambert-St Louis

Wed 10/15

1:30 pm-1:15 pm

2 stops15h 45m

Sofia

Fri 11/14

2:35 pm-3:29 pm

2 stops32h 54m

$581

St. LouisSofia

STL - SOF

STLSOF

Lambert-St Louis

Sun 10/19

4:05 pm-12:00 pm

2 stops35h 55m

Sofia

Tue 11/4

6:00 am-3:29 pm

2 stops41h 29m

$586

St. LouisSofia

STL - SOF

STLSOF

Lambert-St Louis

Wed 10/15

3:30 pm-5:50 pm

1 stop18h 20m

Sofia

Thu 11/13

2:00 pm-11:44 pm

2 stops17h 44m

$587

St. LouisSofia

STL - SOF

STLSOF

Lambert-St Louis

Mon 10/27

6:43 pm-6:20 pm

2 stops16h 37m

Sofia

Wed 11/19

6:10 am-1:55 pm

1 stop15h 45m

$593

St. LouisSofia

STL - SOF

STLSOF

Lambert-St Louis

Tue 11/25

5:30 pm-10:45 pm

2 stops21h 15m

Sofia

Wed 12/3

6:10 am-1:55 pm

1 stop15h 45m

$605

St. LouisSofia

STL - SOF

STLSOF

Lambert-St Louis

Wed 10/15

1:30 pm-1:15 pm

2 stops15h 45m

Sofia

Fri 11/14

2:35 pm-3:29 pm

2 stops32h 54m

$611

St. LouisSofia

STL - SOF

STLSOF

Lambert-St Louis

Tue 11/25

1:35 pm-6:20 pm

2 stops20h 45m

Sofia

Thu 12/4

2:35 pm-3:29 pm

2 stops32h 54m

$612

St. LouisSofia

STL - SOF

STLSOF

Lambert-St Louis

Thu 11/27

4:05 pm-6:00 pm

2 stops17h 55m

Sofia

Fri 12/5

2:35 pm-3:29 pm

2 stops32h 54m

$668

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 13 resultsSorted by cheapest first

How to get the cheapest flight ticket from St. Louis to Sofia

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

Prices

Airlines

What is the cheapest month to fly to Sofia?

The cheapest month to fly to Sofia from St. Louis is in February. Flight prices, which tend to average around $640, are often lower during this time because this is during the off-season. If you aren’t able to travel during the month of February, then book flights to Sofia from St. Louis during January instead. Flights to Sofia in January, while not as cheap as those in February, still average around $751.

What is the cheapest day to depart on your flight to Sofia?

According to our data, Saturday is the cheapest day to fly to Sofia from St. Louis. The lowest ticket price found for a Saturday departure recently was $1,095. Keep in mind that prices can always vary depending on your route and whether or not you are flying domestic or international. Flights from St. Louis to Sofia on a Friday will generally be more expensive and average around $1,306. Keep in mind that these prices on both days could fluctuate depending on the season and the demand.

What is the cheapest time of day to depart on your flight to Sofia?

In the morning is the cheapest time of day to fly from St. Louis to Sofia when you can find flight prices for as low as $1,199. Flying to Sofia in the morning is an ideal time because this is during off-peak travel hours. In the afternoon is when there is more demand to fly to Sofia, so prices are often more expensive at around $1,335 per ticket.

How far in advance should I book a flight to Sofia?

You are more likely to see cheaper flights to Sofia from St. Louis when booking weeks ahead of your departure date. In general, you can expect to find flights to Sofia for around $978 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Sofia from St. Louis for as low as $799 on momondo.

When to book flights from St. Louis to Sofia

Are you open to changing your travel dates? Check out the ideal times to fly from St. Louis to Sofia according to our flight data. Find out which month and days have the cheapest flights.

Estimated round-trip price

Cheap St. Louis to Sofia (STL to SOF) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from St. Louis to Sofia

Direct flights	None

There are no direct flights from St. Louis to Sofia. There are no popular flight routes from St. Louis to Sofia.

Search flight deals

How far is Lambert-St Louis to Sofia by plane?
A flight from Lambert-St Louis to Sofia will travel around 5441.0 mi. 13h 30m is a normal flight duration for this route.
When did momondo last update prices for flights from Lambert-St Louis Airport to Sofia Airport?
Prices for flights from Lambert-St Louis Airport to Sofia Airport are updated daily.
How many operators does momondo search for flights from Lambert-St Louis Airport to Sofia Airport?
The number of operators available for flights from Lambert-St Louis Airport to Sofia Airport is 2 as of September 2025.
How old do you have to be to fly from Lambert-St Louis Airport to Sofia Airport?
The minimum age for a child to fly alone is five, but airlines that offer an unaccompanied minor (UNMR) service may have their own age limitations. Flight duration, scheduling, and layovers are among the considerations that may influence age limits. We recommend that you double-check with the airline you are booking with for travel from Lambert-St Louis Airport to Sofia Airport.
What documentation or ID do you need to fly to Sofia Airport?
The travel and health documents you'll need for your trip to Sofia Airport may differ based on your itinerary and personal situation. Typically, you should have several documents on hand, such as a national ID card or driver's license and a passport that is valid for six months after your intended arrival at Sofia Airport. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.
What is the most popular airline from St. Louis to Sofia?
Based on momondo bookings for flights between St. Louis and Sofia, the leading airline is Lufthansa, making up 80% of the total bookings. Other popular airlines include United Airlines with 20%.

Best airlines flying from St. Louis to Sofia

Compare and see reviews for airlines that fly from St. Louis to Sofia with momondo

Airline	Rating	Free Cancellation	Price
Lufthansa	PriceFrom $669	Free Cancellation	Rating 6.8 7,390 reviews		Search Lufthansa flights
United Airlines	PriceFrom $711	Free Cancellation	Rating 7.4 8,937 reviews		Search United Airlines flights

Bansko

Borovets

Velingrad

Sandanski

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Why should I use momondo to find a flight deal from St. Louis to Sofia?

momondo collates all your flight options in one place and lets you filter them to find the perfect flight from St. Louis to Sofia. momondo saves you time and could save you money on your trip.

Can I find flights from St. Louis to Sofia with flexible booking policies on momondo?

Yes. momondo enables you to select and highlight flights to Sofia from St. Louis with this policy.

How can momondo help me find flights from St. Louis to Sofia?

Once all potential St. Louis to Sofia flight options are in front of you, momondo lets you sort and filter flights based on preferences such as airline, price and flight times amongst many other options.

I’m not ready to book a flight from St. Louis to Sofia right now. Can momondo alert me if prices change?

Price alerts on flights to Sofia from St. Louis are quick and easy to set up on momondo. Simply perform a search and select the price alert feature. It is as simple as that.

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Cheap flights from St. Louis to Sofia from $416

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from St. Louis to Sofia departing on 10/15. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.

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Lufthansa flights from St. Louis to Sofia

Our best Lufthansa deals on St. Louis to Sofia flight tickets

Air Canada flights from St. Louis to Sofia

Our best Air Canada deals on St. Louis to Sofia flight tickets

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How to get the cheapest flight ticket from St. Louis to Sofia

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

What is the cheapest month to fly to Sofia?

What is the cheapest day to depart on your flight to Sofia?

What is the cheapest time of day to depart on your flight to Sofia?

How far in advance should I book a flight to Sofia?

What is the cheapest airline that flies from Lambert-St Louis to Sofia?

British Airways and United Airlines are the most popular carriers operating from Lambert-St Louis to Sofia

When to book flights from St. Louis to Sofia

Cheap St. Louis to Sofia (STL to SOF) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from St. Louis to Sofia

Direct flights

How far is Lambert-St Louis to Sofia by plane?

When did momondo last update prices for flights from Lambert-St Louis Airport to Sofia Airport?

How many operators does momondo search for flights from Lambert-St Louis Airport to Sofia Airport?

How old do you have to be to fly from Lambert-St Louis Airport to Sofia Airport?

What documentation or ID do you need to fly to Sofia Airport?

What is the most popular airline from St. Louis to Sofia?

Best airlines flying from St. Louis to Sofia

Compare and see reviews for airlines that fly from St. Louis to Sofia with momondo

Traveling to a place near Sofia?

Why use momondo?

Why should I use momondo to find a flight deal from St. Louis to Sofia?

Can I find flights from St. Louis to Sofia with flexible booking policies on momondo?

How can momondo help me find flights from St. Louis to Sofia?

I’m not ready to book a flight from St. Louis to Sofia right now. Can momondo alert me if prices change?

An easier way to manage your Sofia trip

We make it super easy to schedule, organize and travel with friends or family. Trips is free — and available to use no matter where you book.

Get notified when prices go down

Daily price changes in your inbox - only with Price Alerts.

Find better results for your trip to Bulgaria

Fly your favorite airline to Sofia

Airlines are sorted and displayed according to clicks in the past 7 days on momondo